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the slab has buried radiant heating elements for our garage. The winters are as cold as -30 degrees F in northern Maine. I am going to install a below ground ( about 15 inches) composting pit with a wood door to keep away critters. the ground does freeze in winter down to about 4 feet in bad snow years. We do not want to mess up the heated garage or the foundation. How closely can I dig to the concrete slab? thank, roberta